diff --git a/sql/17_xx.sql b/sql/17_xx.sql
index 240ddc287b0caad1de1bbe06c81cfe97b7d24d49..8a5922aac395033de139b967484a522851c0b92d 100755
--- a/sql/17_xx.sql
+++ b/sql/17_xx.sql
@@ -135,6 +135,8 @@ ALTER TABLE res_version_attachments DROP COLUMN IF EXISTS signatory_user_serial_
 ALTER TABLE res_version_attachments ADD signatory_user_serial_id int;
 ALTER TABLE listinstance DROP COLUMN IF EXISTS signatory;
 ALTER TABLE listinstance ADD signatory boolean default false;
+ALTER TABLE listinstance DROP COLUMN IF EXISTS requested_signature;
+ALTER TABLE listinstance ADD requested_signature boolean default false;
 CREATE VIEW res_view_attachments AS
   SELECT '0' as res_id, res_id as res_id_version, title, subject, description, publisher, contributor, type_id, format, typist,
     creation_date, fulltext_result, ocr_result, author, author_name, identifier, source,
diff --git a/sql/structure.sql b/sql/structure.sql
index ed9b8a8cbffab01537cf3724e649c441dab35151..6b4bc7399731568fc986edc48fa5eb21c5d78573 100755
--- a/sql/structure.sql
+++ b/sql/structure.sql
@@ -680,6 +680,8 @@ CREATE TABLE listinstance
   difflist_type character varying(50),
   process_date timestamp without time zone,
   process_comment character varying(255),
+  signatory boolean default false,
+  requested_signature boolean default false
   CONSTRAINT listinstance_pkey PRIMARY KEY (listinstance_id)
 )
 WITH (OIDS=FALSE);